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AdministeringIn addition to administering the database server, you can tune performance, replicate data, and archive data.
System administrationThese topics contain concepts, procedures, and reference information for database and database server administrators to use for managing and tuning HCL OneDB™ database servers.
Administrator's GuideThe HCL OneDB™ Administrator's Guide provides the information required to administer HCL OneDB™.
High availability and scalabilityA successful production environment requires database systems that are always available, with minimal if any planned outages, and that can be scaled quickly and easily as business requirements change.
Connection management through the Connection ManagerConnection Managers can control automatic failover for high-availability clusters, monitor client connections and direct requests to appropriate database servers, act as proxy servers and handle client/server communication, and prioritize connections between application servers and the primary server of a high-availability cluster. Connection Managers support high-availability clusters, replicate sets, server sets, and grids.
Configuring connection managementTo configure connection management, you must install software, set environments and connectivity information, create Connection Manager configuration files, and run the oncmsm utility.
Starting Connection Managers on UNIX™ and Linux™Use the oncmsm utility to start a Connection Manager.

Starting Connection Managers on UNIX and Linux

Use the oncmsm utility to start a Connection Manager.

About this task

A Connection Manager can be started before the database servers it manages are started. If a connection unit is managed by a Connection Manager, the Connection Manager connects to database servers in the connection unit after the database servers start.

If the database servers of a connection unit are online before a Connection Manager is initialized, start the Connection Manager, and then direct client application requests to the Connection Manager instead of the database servers.

Procedure

Start the Connection Manager by running the oncmsm utility with the c parameter and the name of the Connection Manager configuration file.
```
oncmsm -c configuration_file
```
The default location for the configuration file is the $ONEDB_HOME/etc directory.
If you enabled Connection Manager logging by setting the LOG and LOGFILE parameters in the Connection Manager's configuration file, check the log to verify that the Connection Manager successfully started.
The following message displays is the Connection Manager started:
```
Connection Manager started successfully
```

Results

After a Connection Manager initializes, it attempts to connect to the database servers or groups of database servers that are specified by the ONEDB_SERVER parameter in the Connection Manager's configuration file. The Connection Manager then searches for and connects to all the database servers that are in each specified server's cluster, grid, or replicate set.

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